From DDL Wiki

Contents 1 About 1.1 Group Members 2 Product Dissection 2.1 Function 2.2 Input 2.3 Output 2.4 Normal Use 2.5 Special Considerations 2.6 Other Uses

About

This is the project Wiki for Team 8 in 24-441 Engineering Design Course. The product we have chosen to analyze is a car jack.

Group Members

• Matt Wasserman
• Alberto Guzman
• Saran Soongsawang

Product Dissection

Documentation of Team 8's Product Dissection

Function

• Typically used to lift up the corner of a car, normally for changing a tire.

Input

• Crank, which rotates threaded rod

Output

• Vertical motion up or down that locks in place

Normal Use

1. User kneels down in next to car.
2. Jack is placed flat under car.
3. Crank arm end placed into eyelet or car.
4. Crank arm held up in one hand and rotated clockwise with the other.
5. When upward motion of jack gets close to car frame, user aligns jack as necessary make sure it is securely aligned with the pinch weld on the car's frame.
6. User continues to rotate crank arm as the jack lifts the car until the desired height is reached.
7. After the user is done changing the tire the crank arm is rotated counter-clockwise until the jack is completely closed

Special Considerations

• Might be difficult for some users to kneel down next to car and reach under for correct placement.
• Depending on lighting, can be difficult to ensure proper alignment.
• When rotating crank arm it is easy to bash knuckles into the ground
• Must be careful (cannot rotate to fast, must be in right position) when rotating or else the entire jack, not just the threaded rod, rotates. The jack must then be repositioned. This is the case when the jack has not yet secured itself between the car and the ground.

Other Uses

• Separating two objects
• Bending Pipe
• Lift heavy objects
• Push heavy objects.